readiness: emphasizes the quickness or promptness with which something is done: indicated her ~ for the task.   （prompt快速和quick的区别是，prompt强调因为训练有素所以能够快速，可形容急救或抢险等，如prompt response快速响应）


ease: implies absence of strain or care or hesitation with resulting smooth efficiency in performance: answer a series of questions with ~.


facility: is often very close to ease, but sometimes suggests a slick superficiality rather than true ease: a ~ with words that was almost too glib.      (slick光滑，贬义=extremely smooth，形容地面时表示光滑容易摔倒，如slipped and fell on the slick floor地太滑摔倒了)


dexterity: implies proficient skill such as results from training and practice: handled the class with the ~ of a master.    （proficient精通的意思是全面具备某方面的能力thorough competence derived from training and practice,如a translator thoroughly proficient in Russian一位精通俄语的翻译）   (skill技术，指具备专业知识technical knowledge, 如the skills required of a surgeon外科医生需要的技术）


readiness准备就绪: 强调能够快速完成某事，ease轻松: 表示做事不费力不操心犹豫，因此顺利高效，facility轻松: 可能只是表面肤浅而不是真正的轻松，dexterity娴熟熟练: 表示精通技术，源自培训练习。


记忆方法: 1）首字母refd想成Fred<==做事轻松         Fred是Friedrich或Frederick的昵称，尼采全名Friedrich Nietzsche，腓特烈大帝Frederick the Great都是德国人


         2）轻松的意思是做事不费力mean the power of doing something without evidence of effort.